Bugfixes and Rails Edge

Update to Rails 2.3.1.
  (Actually, not quite. Doesn't look like 2.3.1 will be released
   today, but I REALLY want to push these bugfixes out.)
Removed bundled Rack (Rails 2.3.1 comes bundled with Rack 1.0).
Add
     config.action_view.cache_template_loading = true
  to production environment.
Fix FastCGI bug (http://rubyforge.org/tracker/index.php?func=detail&aid=24191&group_id=186&atid=783).
Fix WikiWords bug (http://rubyforge.org/pipermail/instiki-users/2009-February/001181.html).

vendor/rails/actionpack/lib/action_controller/test_process.rb

@@ -4,8 +4,12 @@ module ActionController #:nodoc:
     attr_accessor :query_parameters, :path, :session
     attr_accessor :host
 
-    def initialize
-      super(Rack::MockRequest.env_for("/"))
+    def self.new(env = {})
+      super
+    end
+
+    def initialize(env = {})
+      super(Rack::MockRequest.env_for("/").merge(env))
 
       @query_parameters   = {}
       @session            = TestSession.new